Malicious PDF — malware analysis report

Static analysis result for SHA-256 956d24f80bcaec94…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 22:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31c940d05966ca12fd693a071c2ba147 SHA-1: add0cb8722f4e09bac691edca8248f134251ed36 SHA-256: 956d24f80bcaec94c98c117dd4f076be3db90edd0a26b6926810bfdf65c4c325
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, many on disposable hosting and using UTM parameters, suggest a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this type of activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=kurt+saxon+pdf PDF link annotation
    • https://giorgiosantinelli.it/file/41727727345.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/25282451819.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/lusutidolepufadasaraku.pdfIn PDF document text
    • https://equimat-cheval.fr/file/nodarelivoxomoki.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/466605721.pdfIn PDF document text
    • https://highrise.pl/file/42339232511.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/63935201289.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/9258265743.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/50125510748.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/24870067702.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/25563291046.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210910/file/19273549960.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/vawajuj.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/lasuzevezegito.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/namulejirepak.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/86155715048.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/8677956694.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e129d97e---tomevodomizakujilokaned.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/vojexawuwunizobavilu.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fuvojonuwusinubumepofer.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/bopodol.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/jaxow.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/39578947291.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 10416 bytes
SHA-256: 8af2419cd8fc395f0dae03311669c71e84d96736da6de21560d31512d069d7db
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 19268 bytes
SHA-256: 3e09d9610c7015bab1d964ddad51bcd78370fb7a602da2621e304ac4fd9cfd62

Open this report in the interactive analyzer, or submit your own file for analysis.